Pile foundation reinforcement cage positioning system and method

Abstract

This invention relates to the field of pile foundation construction technology, specifically a pile foundation reinforcement cage positioning system. The system comprises several airbags arranged circumferentially around the reinforcement cage, with the airbags fixed to the reinforcement bars by clamps. It also includes an air pump connected to an inflation conduit and a deflation conduit. The inflation conduit has several inflation branches corresponding to the airbags, with the ends of the branches connected to the airbags. The deflation conduit has several deflation branches corresponding to the airbags. A solenoid valve is installed on the branch pipe. A controller is also included, with the air pump and solenoid valve electrically connected to it. The inflation and deflation of the airbags are simple, enabling rapid positioning of the reinforcement cage. It is applicable to various engineering requirements and has strong applicability. Real-time monitoring of the pressure sensor allows for precise adjustment of the reinforcement cage position, improving positioning accuracy. Accurate positioning of the reinforcement cage helps improve the quality and stability of pile foundations, diaphragm walls, and other engineering projects.

Description

Technical Field

[0001] This invention relates to the field of pile foundation construction technology, specifically to a pile foundation reinforcement cage positioning system and method. Background Technology

[0002] Reinforced concrete cast-in-place piles are piles formed by drilling holes on-site at the pile location, placing a reinforcing cage inside the hole, and then pouring concrete. In the traditional process of installing reinforcing cages, since the pile hole depth is generally greater than ten meters, the corresponding height of the reinforcing cage is also greater than ten meters. After the reinforcing cage is hoisted into the pile hole, the verticality of the reinforcing cage cannot be guaranteed. The verticality of the reinforcing cage is crucial to the quality and safety of the project.

[0003] An existing application (CN202310659417.8) describes a method for positioning the reinforcing cage of a manually excavated bored pile. This method involves creating a circular reinforcing ring with the same diameter as the pile cage, welding a crosshair at its center, and hanging a laser plumb bob on the crosshair. The horizontal and vertical positioning is achieved through the cooperation of the laser plumb bob and the circular reinforcing ring with the welded crosshair. However, during construction, the following drawbacks were found in this existing technology: 1. The circular reinforcing ring must be welded horizontally, requiring the use of a theodolite or total station for control and fixation, which is inconvenient; 2. The laser plumb bob is prone to wobbling during lowering, wasting time waiting for it to stop swinging; 3. The laser beam is affected by ambient light inside the pile hole, making observation difficult; 4. The laser plumb bob is difficult to retrieve and reuse once it is lowered to the bottom of the pile hole along with the reinforcing cage. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this invention is to provide a solution.

[0005] The technical solution adopted by this invention to solve its technical problem is:

[0006] A pile foundation reinforcement cage positioning system includes several airbags arranged circumferentially around the reinforcement cage, with the airbags fixed to the reinforcement bars of the cage by clamps; it also includes an air pump connected to an air pipe, with several branch pipes corresponding to the airbags on the air pipe, the ends of the branch pipes connected to the airbags; a pressure sensor located on the side of the airbag away from the reinforcement cage; a solenoid valve installed on the branch pipe; and a controller, with the air pump, solenoid valve, and pressure sensor all electrically connected to the controller.

[0007] As a preferred embodiment, a further technical solution of the present invention is:

[0008] Preferably, the clamp includes a first clamping plate and a second clamping plate. The front part of the first clamping plate is a first clamping part, and the rear part is a second clamping part. The front part of the second clamping plate is a third clamping part, and the rear part is a fourth clamping part. The first clamping plate and the second clamping plate are hinged together in the middle. A return spring is connected between the second clamping part and the fourth clamping part. An airbag is connected between the first clamping part and the third clamping part. In the initial state of the return spring, the second clamping part and the fourth clamping part can clamp the steel bars of the steel cage. After the airbag is inflated, the first clamping part and the third clamping part move in opposite directions, thereby driving the second clamping part and the fourth clamping part to move in opposite directions and release the steel bars.

[0009] Preferably, the return spring is a V-shaped spring sheet.

[0010] Preferably, the airbags are divided into N groups, and the N groups of airbags are arranged longitudinally at intervals in N layers on the steel cage; each group has at least four airbags, and each group of airbags is arranged circumferentially at intervals on the steel cage.

[0011] This invention also discloses a method for positioning a pile foundation reinforcement cage, the specific steps of which are as follows:

[0012] S1: Piling of the pile foundation and fabrication of the reinforcing cage at the same time;

[0013] S2: Several airbags are arranged circumferentially on the steel cage, and the airbags are clamped and fixed to the steel bars of the steel cage by clamps.

[0014] S3: The controller controls the solenoid valve and air pump to inflate several airbags, causing the airbags to expand and make close contact with the surrounding soil or foundation structure, thereby adjusting the steel cage into position.

[0015] S4: The controller controls the solenoid valve and air pump to deflate several airbags, and while deflating, the airbags are pulled out of the pile hole through the branch pipe.

[0016] Preferably, a pressure sensor is installed on the side of the airbag away from the steel cage. The pressure sensor is electrically connected to the controller. In step S3, by observing the pressure sensor readings on each airbag, the steel cage can be adjusted to the preset position with the help of a crane.

[0017] The present invention, which adopts the above technical solution, has the following prominent features compared with the prior art:

[0018] The airbag is easy to inflate and deflate, and can quickly locate the rebar cage. It is applicable to different engineering requirements and has strong applicability. By monitoring the pressure sensor in real time, the position of the rebar cage can be precisely adjusted, which improves the positioning accuracy. After the rebar cage is accurately positioned, it helps to improve the quality and stability of projects such as pile foundations and diaphragm walls. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the steel cage positioning system in an embodiment of the present invention;

[0020] Figure 2 This is a top view of the steel cage positioning system in an embodiment of the present invention.

[0021] Figure 3 This is a top view of the airbag structure of the steel cage positioning system in this embodiment of the invention after inflation;

[0022] Figure 4 This is a schematic diagram of the fixture in an embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of the structure of the clamp after the airbag is inflated in an embodiment of the present invention.

[0024] Explanation of reference numerals in the attached drawings: 1. Reinforcing cage; 2. Airbag; 3. Air pump; 4. Pile hole; 5. Air pipe; 6. Branch pipe; 7. Rock stratum; 8. Soil; 9. First clamping plate; 901. First clamping part; 902. Second clamping part; 10. Second clamping plate; 1001. Third clamping part; 1002. Fourth clamping part; 11. V-shaped spring sheet; 12. Pressure sensor. Detailed Implementation

[0025] The present invention will be further illustrated below with reference to specific embodiments. The purpose of this illustration is solely to provide a better understanding of the invention. Therefore, the examples given do not limit the scope of protection of the present invention.

[0026] like Figures 1 to 5 As shown in the figure, this embodiment provides a pile foundation reinforcement cage positioning system. Several airbags 2 are arranged circumferentially around the reinforcement cage 1, and the airbags 2 are fixed to the reinforcement bars of the reinforcement cage 1 by clamps. The system also includes an air pump 3, connected to an air pipe 5, with several branch pipes 6 corresponding to the airbags 2 on the air pipes 5, the ends of the branch pipes 6 connected to the airbags 2; a pressure sensor 12, located on the side of the airbag 2 away from the reinforcement cage 1; a solenoid valve, installed on the branch pipe 6; and a controller, with the air pump 3, solenoid valve, and pressure sensor 12 all electrically connected to the controller. The controller controls the air pump 3 and solenoid valve to inflate or deflate the airbags 2. After the pile foundation reinforcement cage 1 positioning system is installed on the reinforcement cage 1, the reinforcement cage 1 is placed into the pile hole 4. The airbags 2 are inflated until they are in close contact with the side wall (soil or foundation structure) of the pile hole 4. The readings on each pressure sensor 12 are observed to facilitate the adjustment of the reinforcement cage 1 into position.

[0027] like Figure 4 , Figure 5The clamp includes a first clamping plate 9 and a second clamping plate 10. The first clamping plate 9 has a first clamping part 901 at the front and a second clamping part 902 at the rear. The second clamping plate 10 has a third clamping part 1001 at the front and a fourth clamping part 1002 at the rear. The first clamping plate 9 and the second clamping plate 10 are hinged together at the middle, and the clamp has an overall X-shaped structure. A return spring is connected between the second clamping part 902 and the fourth clamping part 1002. In this embodiment, the return spring is a V-shaped spring sheet 11. An airbag 2 is connected between the first clamping part 901 and the third clamping part 1001. In the initial state of the return spring, the second clamping part 902 and the fourth clamping part 1002 can clamp onto the steel bars of the steel cage 1. After the airbag 2 is inflated, the first clamping part 901 and the third clamping part 1001 are opened, which in turn drives the second clamping part 902 and the fourth clamping part 1002 to open and release the steel bars.

[0028] When the height of the reinforcing cage 1 is less than 15m, only one set of four airbags 2 needs to be installed at the bottom of the reinforcing cage 1. The four airbags 2 are respectively installed on the front, back, left and right sides of the reinforcing cage 1, and the four airbags 2 are located at the same horizontal level, specifically, at a height of 1-3m from the bottom of the reinforcing cage 1. A lifting point is set at the top of the reinforcing cage 1. By observing the readings of the pressure sensors 12 on the four airbags 2, the crane adjusts the position of the reinforcing cage 1 to ensure that the bottom of the reinforcing cage 1 is accurately positioned. After the bottom is accurately positioned, the distance between the top of the reinforcing cage 1 and the four sides (front, back, left and right) and the sidewall of the pile hole 4 is measured manually.

[0029] When the height of the steel cage 1 is greater than or equal to 15m, several airbags 2 are divided into N groups, N≥2, and the N groups of airbags 2 are arranged longitudinally on the steel cage 1 in N layers; each group has at least four airbags 2, and several airbags 2 in each group are arranged circumferentially on the steel cage 1; by observing the readings of each pressure sensor 12 on all airbags 2, the crane adjusts the position of the steel cage 1 to make the bottom and middle of the steel cage 1 accurately positioned, that is, to ensure the verticality of the steel cage 1.

[0030] The present invention also discloses a method for positioning the reinforcement cage 1 of a pile foundation, the specific steps of which are as follows:

[0031] S1: Piling of the pile foundation, and construction of steel cage 1 at the same time.

[0032] S2: Several airbags 2 are arranged circumferentially on the steel cage 1, and the airbags 2 are divided into N groups, with at least four in each group; when the height of the steel cage 1 is less than 15m, N=1, and only one group of airbags 2 needs to be set at the bottom of the steel cage 1. The airbags 2 in the same group are at the same horizontal elevation and are arranged circumferentially on the steel cage 1; when the height of the steel cage 1 is greater than or equal to 15m, N≥2, and the N groups of airbags 2 are arranged longitudinally in N layers on the steel cage 1, with the airbags 2 in each group arranged circumferentially on the steel cage 1; wherein, the airbags 2 are clamped and fixed to the steel bars of the steel cage 1 by clamps.

[0033] Specifically, such as Figure 4 , Figure 5 As shown, the clamp includes a first clamping plate 9 and a second clamping plate 10. The first clamping plate 9 has a first clamping part 901 at the front and a second clamping part 902 at the rear. The second clamping plate 10 has a third clamping part 1001 at the front and a fourth clamping part 1002 at the rear. The first clamping plate 9 and the second clamping plate 10 are hinged together in the middle, and the clamp has an overall X-shaped structure. A return spring is connected between the second clamping part 902 and the fourth clamping part 1002. An airbag 2 is connected between the first clamping part 901 and the third clamping part 1001. In the initial state of the return spring, the second clamping part 902 and the fourth clamping part 1002 can clamp onto the steel bars of the steel cage 1. After the airbag 2 is inflated, the first clamping part 901 and the third clamping part 1001 are opened, which in turn drives the second clamping part 902 and the fourth clamping part 1002 to open and release the steel bars.

[0034] S3: The controller controls the solenoid valve and air pump 3 to inflate several airbags 2, causing the airbags 2 to expand and make close contact with the surrounding soil or foundation structure. The readings of the pressure sensors 12 on several airbags 2 are observed. With the help of the crane, the steel cage 1 is adjusted to the preset position. After the steel cage 1 is adjusted to the preset position, the difference in readings of the pressure sensors 12 on several airbags 2 at the same elevation is less than 0.05Pa.

[0035] S4: The controller controls the solenoid valve and air pump 3 to deflate several airbags 2. While deflating, the airbags 2 are pulled out of the pile hole 4 by shaking and pulling the branch pipe 6. During the shaking process, the second clamp 902 and the fourth clamp 1002 are staggered from the steel bars on the steel cage 1, so that the airbags 2, along with the pressure sensor 12 on the airbags 2 and the clamps, can be pulled out of the pile hole 4 together.

[0036] This positioning system is applicable to various engineering requirements, has strong applicability, is simple to operate, requires no technical expertise or professional knowledge, facilitates rapid adjustment of the rebar cage, and improves positioning accuracy; thus, it helps to improve the quality and stability of projects such as pile foundations and diaphragm walls.

[0037] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the invention. All equivalent changes made based on the description and drawings of the present invention are included within the scope of the present invention.

Claims

1. A pile foundation reinforcement cage positioning system, characterized in that: Several airbags are arranged circumferentially around the steel cage, and the airbags are fixed to the steel bars of the steel cage by clamps. It also includes an air pump, which is connected to an air tube. The air tube has several branch tubes corresponding to several airbags, and the ends of the branch tubes are connected to the airbags. The pressure sensor is located on the side of the airbag away from the steel cage; Solenoid valve, installed on branch pipe; The controller, air pump, solenoid valve and pressure sensor are all electrically connected to the controller; the clamp includes a first clamping plate and a second clamping plate, the front part of the first clamping plate is the first clamping part and the rear part is the second clamping part; the front part of the second clamping plate is the third clamping part and the rear part is the fourth clamping part; the first clamping plate and the second clamping plate are hinged to each other in the middle, and a return spring is connected between the second clamping plate and the fourth clamping plate. The airbag is connected between the first clip and the third clip; In the initial state of the return spring, the second and fourth clamps can clamp onto the steel bars of the steel cage. After the airbag is inflated, the first and third clamps move in opposite directions, which in turn drives the second and fourth clamps to move in opposite directions, releasing the steel bars.

2. The pile foundation reinforcement cage positioning system according to claim 1, characterized in that: The return spring is a V-shaped spring plate.

3. The pile foundation reinforcement cage positioning system according to claim 1, characterized in that: Several airbags are divided into N groups, and the N groups of airbags are arranged longitudinally at intervals in N layers on the steel cage; each group has at least four airbags, and each group of airbags is arranged circumferentially at intervals on the steel cage.

4. A method for positioning a pile foundation reinforcement cage, characterized in that, The specific steps of using the pile foundation reinforcement cage positioning system described in claim 3 are as follows: S1: Piling of the pile foundation and fabrication of the reinforcing cage at the same time; S2: Several airbags are arranged circumferentially on the steel cage, and the airbags are clamped and fixed to the steel bars of the steel cage by clamps. S3: The controller controls the solenoid valve and air pump to inflate several airbags, causing the airbags to expand and make close contact with the surrounding soil or foundation structure, thereby adjusting the steel cage into position. S4: The controller controls the solenoid valve and air pump to deflate several airbags, and while deflating, the airbags are pulled out of the pile hole through the branch pipe.

5. The method for positioning the pile foundation reinforcement cage according to claim 4, characterized in that: A pressure sensor is installed on the side of the airbag away from the steel cage. The pressure sensor is electrically connected to the controller. In step S3, by observing the pressure sensor readings on each airbag, the steel cage is adjusted to the preset position with the help of a crane.

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